网上搜的，感觉挺好，希望能给和我一样的初学者带来方便

1：查看是否有存储卡插入

String status

=

Environment.getExternalStorageState();

if

(status.equals(Enviroment.MEDIA_MOUNTED))

{

说明有SD卡插入

}

2：让某个Activity透明 

OnCreate中不设Layout this.setTheme(R.style.Theme_Transparent); 以下是Theme_Transparent的定义（注意transparent_bg是一副透明的图片）

3：在屏幕元素中设置句柄，使用Activity.findViewById来取得屏幕上的元素的句柄. 使用该句柄您可以设置或获取任何该对象外露的值.

 

TextView msgTextView = (TextView)findViewById(R.id.msg); msgTextView.setText(R.string.push_me);

4：发送短信 

 

 

String body=”this is mms demo”; Intent mmsintent = new Intent(Intent.ACTION_SENDTO, Uri.fromParts(”smsto”, number, null)); mmsintent.putExtra(Messaging.KEY_ACTION_SENDTO_MESSAGE_BODY, body); mmsintent.putExtra(Messaging.KEY_ACTION_SENDTO_COMPOSE_MODE, true); mmsintent.putExtra(Messaging.KEY_ACTION_SENDTO_EXIT_ON_SENT, true); startActivity(mmsintent);

 

5:发送彩信 

StringBuilder sb = new StringBuilder(); sb.append(”file://”); sb.append(fd.getAbsoluteFile()); Intent intent = new Intent(Intent.ACTION_SENDTO, Uri.fromParts(”mmsto”, number, null)); // Below extra datas are all optional. intent.putExtra(Messaging.KEY_ACTION_SENDTO_MESSAGE_SUBJECT, subject); intent.putExtra(Messaging.KEY_ACTION_SENDTO_MESSAGE_BODY, body); intent.putExtra(Messaging.KEY_ACTION_SENDTO_CONTENT_URI, sb.toString()); intent.putExtra(Messaging.KEY_ACTION_SENDTO_COMPOSE_MODE, composeMode); intent.putExtra(Messaging.KEY_ACTION_SENDTO_EXIT_ON_SENT, exitOnSent); startActivity(intent);

6:显示toast 

Toast.makeText(this._getApplicationContext(), R.string._item, Toast.LENGTH_SHORT).show();

7：发送Mail

mime = “img/jpg”;             shareIntent.setDataAndType(Uri.fromFile(fd), mime);             shareIntent.putExtra(Intent.EXTRA_STREAM, Uri.fromFile(fd));             shareIntent.putExtra(Intent.EXTRA_SUBJECT, subject);             shareIntent.putExtra(Intent.EXTRA_TEXT, body);

8:注册一个BroadcastReceiver 

registerReceiver(mMasterResetReciever, new IntentFilter(”OMS.action.MASTERRESET”)); private BroadcastReceiver mMasterResetReciever = new BroadcastReceiver() {         public void onReceive(Context context, Intent intent){             String action = intent.getAction();             if(”oms.action.MASTERRESET”.equals(action)){                 RecoverDefaultConfig();             }         }     };

9:定义ContentObserver，监听某个数据表 

private ContentObserver mDownloadsObserver = new DownloadsChangeObserver(Downloads.CONTENT_URI); private class DownloadsChangeObserver extends ContentObserver {         public DownloadsChangeObserver(Uri uri) {             super(new Handler());         }         @Override         public void onChange(boolean selfChange) {｝          }

10:获得 手机UA 

public String getUserAgent()     {            String user_agent = ProductProperties.get(ProductProperties.USER_AGENT_KEY, null);             return user_agent;     }

11：清空手机上cookie 

CookieSyncManager.createInstance(getApplicationContext());         CookieManager.getInstance().removeAllCookie();

12：建立GPRS连接

//Dial the GPRS link.     private boolean openDataConnection() {         // Set up data connection.         DataConnection conn = DataConnection.getInstance();                 if (connectMode == 0) {                 ret = conn.openConnection(mContext, “cmwap”, “cmwap”, “cmwap”);             } else {                 ret = conn.openConnection(mContext, “cmnet”, “”, “”);             }     }

13：PreferenceActivity 用法 

setting.xml:

public class Setting extends PreferenceActivity ｛     public void onCreate(Bundle savedInstanceState) {         super.onCreate(savedInstanceState);         addPreferencesFromResource(R.xml.settings)；     } ｝

14:通过HttpClient从指定server获取数据

DefaultHttpClient httpClient = new DefaultHttpClient();             HttpGet method = new HttpGet(“http://www.baidu.com/1.html”);             HttpResponse resp;             Reader reader = null;             try {                 // AllClientPNames.TIMEOUT                 HttpParams params = new BasicHttpParams();                 params.setIntParameter(AllClientPNames.CONNECTION_TIMEOUT, 10000);                 httpClient.setParams(params);                 resp = httpClient.execute(method);                 int status = resp.getStatusLine().getStatusCode();                 if (status != HttpStatus.SC_OK) return false;                 // HttpStatus.SC_OK;                 return true;             } catch (ClientProtocolException e) {                 // TODO Auto-generated catch block                 e.printStackTrace();             } catch (IOException e) {                 // TODO Auto-generated catch block                 e.printStackTrace();             } finally {                 if (reader != null) try {                     reader.close();                 } catch (IOException e) {                     // TODO Auto-generated catch block                     e.printStackTrace();                 }             }

本文摘自：http://www.cmd100.com/bbs/thread-4674-1-1.html